Qt stack Commercial licensing of the Qt framework and development tools. License compatibility totally risk-free Interoperability between libraries guaranteed High-quality development and design tooling included Commercial professional support Known hardware requirements for product budgeting Lower development and maintenance costs with cross-platform libraries VS.
Managing license compatibility can be complex, risky and time-intensive Adds development testing time for guaranteeing library interoperability Cost for leveling up development and design tooling Varying quality of support resources Volatility of dependencies across multiple code bases Unpredictable BoM.
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Try Qt. Qt comes loaded with resources. Learn what you can achieve with Qt Resource Center. Qt Documentation Here you'll find documentation for Qt, a cross-platform software development framework Dive In. Built with Qt. Frequently Asked Questions. If you create a device, you need Qt for Device Creation License.
The Qt for Application Development license is sufficient to create applications that run on desktop PCs, mobile phones, or tablets. These kinds of computers are typically used also for reading email, browsing the Internet and so on. A Qt-based application is only one of many applications on these computers. The main use case of these computers is not dedicated to the use of your Qt-based application. Contact us to learn more. You are not permitted to further distribute your applications.
Locking of devices, also known as Tivoization, is allowed under the commercial license. Yes, unlike some open-source setups, static linking is allowed with a commercial Qt license.
No, it does not. Qt libraries may be distributed in binary form only with the application. Please contact Qt sales for discussing the best possible upgrade choice.
Licenses are transferable every 6 months. To use static linking, Qt must be built with the -static configuration option. The following configure command selects the correct options and sysroot for the Raspberry Pi 2. To make the set of configure options reusable and more readable, the device-specific paths are defined as environment variables:. To configure and build Qt for some other device, modify the variables to contain the correct sysroot paths and device target strings as they appear in your Qt for Device Creation installation.
Above, -prefix sets the intended destination of the Qt build on the device sysroot. Ask Question. Asked 3 years, 11 months ago. Active 3 years, 11 months ago. Viewed 23k times. Scenario 1 - Open Source - Dynamic Linking I think I can develop the closed source application as long as I dynamically link against the framework, meaning that the customer can change the framework of QT if they choose.
What License Can I use with these options? I don't plan to make any changes to QT Framework. If I did I would submit changes and provide source code for the changes, with no problem. I don't want to provide source code to my actual program, but it can be easily hacked anyway if I use dynamic linking anyway.
I don't mind providing a link to Qt or showing the logo. I don't mind buying a commercial license but I feel a little heartbroken because I can't use any of the features of a commercial license to protect my code. If I am reduced to dynamically linking I prefer to use the open source free version. If only the WebEngine was able to statically link, this question would be a no-brainer. I want to protect my source code in some way to make it difficult for hackers. I want the extra level of protection, so I can sleep at night knowing that while my application is not hack proof, it's a bit harder for a script kiddie to decompile the application.
The software is given away for free but it does have an option to upgrade and use additional services from our main server. Most of the heavy lifting is actually done on our server. This is our hobby project that has grown over the years.
What are my options if I wanted to continue to use QT 5. What I can do can do in the open source version. Consult a lawyer. There are so many twists and turns only a lawyer may understand it.
You may gain help from other users in the forum of QT which is still pretty good. You may statically compile the open source version as long as you provide full source code so others may also compile your complete code. No private code allowed if you do this option. As long as you don't make changes to the QT Framework you do not have to provide any source code.
If you modify the QT framework you must submit the changes to QT and provide your software and the QT framework as open source, because your software is not relink able until the changes are made public.
Your private code has to remain open and relink able. You don't have to display the Qt Logo, but it's highly recommended by QT. You may not hide file names that would allow anyone to find out your using QT. I must have a commercial version if I wanted to do this. No lawyer needed it's pretty cut and dry. I must have a commercial version for a closed source for profit to link statically. Make all the changes you want and keep everything private. You can restrict QT Framework versions from Modifications.
Improve this question. David Eaton. David Eaton David Eaton 1 1 gold badge 2 2 silver badges 8 8 bronze badges. Qt Open Source is LGPL, so as you already pointed out, you may use it with your closed source poduct as long as you link it dynamically and allow the user to supply her own verison of Qt.
You are not obligated to show Qt's logo in your application. However, the details of the Qt Commercial product are not open source and are thus off topic here. I think you are overestimating the motivation of legitimate users to dig into your software. Disclaimer: I'm not a lawyer. Reply Quote 1 1 Reply Last reply. But in that case in accordance with the Licence i'll do it dynamic linked. Reply Quote 0 2 Replies Last reply.
QT-static-prgm said in public licence and static linking : But if i'd publish the whole source code you'd be able to "relink" it and it should be no problem, right? Loading More Posts 5 Posts.
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